I live in Indiana, we see Crayfish of every shape and size here. They're not like fish at ALL, you will find ponds with an entire different strain and size of crayfish than you'll see at other places or in rivers. I've kept crayfish with nearly all of my fish, as a matter of fact this is one of the first times ever I've went with something else to clean my tanks (Otocinclus). Yes I've kept crayfish with a betta before. I've also kept crayfish with Cory cats which are slow moving and always on the bottom with them. I've never had an issue. In all honesty if you put crayfish in your tank at a small size chance are you won't even see them until you re decorate and move things. They'll form a den and only seldom come out to pick stuff off the bottom. That being said I've never had experience with a purchased crayfish, only ones I've caught personally. Crayfish will adapt perfectly to almost any tank, they're nearly bullet proof, and I think it's kinder to get a small one and let the tank limit its size than to get a large one that will be miserable and possibly die in too small of a container. I don't think this is cruel to them as they are opportunist species and can be found EVERYWHERE. You can literally find them breeding in stagnant puddles when they're barely 2in long.
Last edited by Brian10962001; 11-22-2011 at 08:06 AM.